Yeah, that's all fair.Not something I've seen, either; but then, outside of my parents, I don't have a lot of people in my circle who would generally bring up shingles in casual conversation.
I only know a little bit about shingles, but isn't it a delayed viral response, or some sort of delayed immune/autoimmune response from chicken pox? Perhaps something with the action of a virus (i.e. creating an immune response) could trigger something that has to do with the shingles pathway? I don't know; just spit-balling.
Vaccines, as with therapeutic drug products, get associated with all manner of side effects. Every single one of them. Some are related, but rare and/or mild enough that they are acceptable. Some are merely correlated (i.e. unrelated to the drug product but were observed during a trial or reported through pharmacovigilance, and are thus included in the adverse event reporting database). Some are frequent and/or severe enough to warrant discontinuing the drug investigation and/or approval process.
So, it honestly never surprises me when someone says, "side effect X was reported for drug Y."
And yeah, shingles is basically the chickenpox virus dormant until... well... until it isn't dormant anymore. I knew from before that it can be triggered by stress, other immuno-issues, or sometimes without a specific trigger at all. Apparently it is quite painful, though, so that particular vaccine is moving up in priority for me.
Thanks!